diff --git a/MPF.Test/RedumpLib/ExtensionsTests.cs b/MPF.Test/RedumpLib/ExtensionsTests.cs
index a969eaf4..829d8779 100644
--- a/MPF.Test/RedumpLib/ExtensionsTests.cs
+++ b/MPF.Test/RedumpLib/ExtensionsTests.cs
@@ -1,21 +1,141 @@
-using RedumpLib.Data;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using RedumpLib.Data;
 using Xunit;
 
 namespace MPF.Test.RedumpLib
 {
     public class ExtensionsTests
     {
-        [Theory]
-        [InlineData(RedumpSystem.BandaiPippin, MediaType.CDROM)]
-        [InlineData(RedumpSystem.MicrosoftXbox, MediaType.DVD)]
-        [InlineData(RedumpSystem.NintendoGameCube, MediaType.NintendoGameCubeGameDisc)]
-        [InlineData(RedumpSystem.NintendoWii, MediaType.NintendoWiiOpticalDisc)]
-        [InlineData(RedumpSystem.NintendoWiiU, MediaType.NintendoWiiUOpticalDisc)]
-        [InlineData(RedumpSystem.SonyPlayStationPortable, MediaType.UMD)]
-        public void GetValidMediaTypesTest(RedumpSystem? knownSystem, MediaType? expected)
+        #region Cross-Enumeration
+
+        /// <summary>
+        /// DiscType values that map to MediaType
+        /// </summary>
+        private static readonly DiscType?[] _mappableDiscTypes = new DiscType?[]
         {
-            var actual = knownSystem.MediaTypes();
-            Assert.Contains(expected, actual);
+            DiscType.BD25,
+            DiscType.BD50,
+            DiscType.CD,
+            DiscType.DVD5,
+            DiscType.DVD9,
+            DiscType.GDROM,
+            DiscType.HDDVDSL,
+            DiscType.NintendoGameCubeGameDisc,
+            DiscType.NintendoWiiOpticalDiscSL,
+            DiscType.NintendoWiiOpticalDiscDL,
+            DiscType.NintendoWiiUOpticalDiscSL,
+            DiscType.UMDSL,
+            DiscType.UMDDL,
+        };
+
+        /// <summary>
+        /// MediaType values that map to DiscType
+        /// </summary>
+        private static readonly MediaType?[] _mappableMediaTypes = new MediaType?[]
+        {
+            MediaType.BluRay,
+            MediaType.CDROM,
+            MediaType.DVD,
+            MediaType.GDROM,
+            MediaType.HDDVD,
+            MediaType.NintendoGameCubeGameDisc,
+            MediaType.NintendoWiiOpticalDisc,
+            MediaType.NintendoWiiUOpticalDisc,
+            MediaType.UMD,
+        };
+
+        /// <summary>
+        /// Check that every supported system has some set of MediaTypes supported
+        /// </summary>
+        /// <param name="redumpSystem">RedumpSystem value to check</param>
+        [Theory]
+        [MemberData(nameof(GenerateRedumpSystemTestData))]
+        public void MediaTypesTest(RedumpSystem? redumpSystem)
+        {
+            var actual = redumpSystem.MediaTypes();
+            Assert.NotEmpty(actual);
         }
+
+        /// <summary>
+        /// Check that both mappable and unmappable media types output correctly
+        /// </summary>
+        /// <param name="mediaType">MediaType value to check</param>
+        /// <param name="expectNull">True to expect a null mapping, false otherwise</param>
+        [Theory]
+        [MemberData(nameof(GenerateMediaTypeTestData))]
+        public void ToDiscTypeTest(MediaType? mediaType, bool expectNull)
+        {
+            DiscType? actual = mediaType.ToDiscType();
+            Assert.Equal(expectNull, actual == null);
+        }
+
+        /// <summary>
+        /// Check that DiscType values all map to something appropriate
+        /// </summary>
+        /// <param name="discType">DiscType value to check</param>
+        /// <param name="expectNull">True to expect a null mapping, false otherwise</param>
+        [Theory]
+        [MemberData(nameof(GenerateDiscTypeTestData))]
+        public void ToMediaTypeTest(DiscType? discType, bool expectNull)
+        {
+            MediaType? actual = discType.ToMediaType();
+            Assert.Equal(expectNull, actual == null);
+        }
+
+        /// <summary>
+        /// Generate a test set of DiscType values
+        /// </summary>
+        /// <returns>MemberData-compatible list of DiscType values</returns>
+        public static List<object[]> GenerateDiscTypeTestData()
+        {
+            var testData = new List<object[]>() { new object[] { null, true } };
+            foreach (DiscType? discType in Enum.GetValues(typeof(DiscType)))
+            {
+                if (_mappableDiscTypes.Contains(discType))
+                    testData.Add(new object[] { discType, false });
+                else
+                    testData.Add(new object[] { discType, true });
+            }
+
+            return testData;
+        }
+
+        /// <summary>
+        /// Generate a test set of RedumpSystem values
+        /// </summary>
+        /// <returns>MemberData-compatible list of RedumpSystem values</returns>
+        public static List<object[]> GenerateRedumpSystemTestData()
+        {
+            var testData = new List<object[]>() { new object[] { null } };
+            foreach (RedumpSystem? redumpSystem in Enum.GetValues(typeof(RedumpSystem)))
+            {
+                testData.Add(new object[] { redumpSystem });
+            }
+
+            return testData;
+        }
+
+        /// <summary>
+        /// Generate a test set of mappable media types
+        /// </summary>
+        /// <returns>MemberData-compatible list of MediaTypes</returns>
+        public static List<object[]> GenerateMediaTypeTestData()
+        {
+            var testData = new List<object[]>() { new object[] { null, true } };
+
+            foreach (MediaType? mediaType in Enum.GetValues(typeof(MediaType)))
+            {
+                if (_mappableMediaTypes.Contains(mediaType))
+                    testData.Add(new object[] { mediaType, false });
+                else
+                    testData.Add(new object[] { mediaType, true });
+            }
+
+            return testData;
+        }
+
+        #endregion
     }
 }